A: Most people would prefer to live in a house that did not let wind, rain, mice, and insects in, so I assume most people live in houses "with connecting edges."
THAT said, if your house is made of reinforced concrete, it will likely survive a M=3-4 shock, but there would be cracks everywhere. Larger events than M=3-4 have in the past led to "pancaking" - whole floors collapsed onto floors below them, with the terrible consequences you can imagine. If a house is constructed of cinder blocks or brick, it is common for facades - whole walls - to collapse. A wood-framed house, however, will flex to a certain degree. Cracks in drywall can easily be taped and sealed and painted over.
My house is wood-framed, and the foundations are interconnected reinforced concrete, excavated down into bedrock. Before I bought the house, I checked the surrounding greenway for any evidence of landslides (trees bent near the base, etc.) and found none. Perhaps my education may then prove to be useful here... eventually. However, in the event of a M = 8+ subduction earthquake, all bets are off. Destruction will be widespread, not only in the houses we live in, but in the infrastructure that provides us with food, water, heat, and electricity.
Perhaps, then, a limited lifetime may also prove useful - I hope not to be around to see this.